need your advice on wireless

[Vu Pham]

On Thu, 2007-06-14 at 08:34 -0500, David Bandel wrote:
> On 6/14/07, Vu Pham <vu at sivell.com> wrote:
> > I have built some wireless ( 802.11a/b/g) networks but they are all in
> > house.
> >
> > Now I get involved into a project that requires me to cover a yard. The
> > size of the yard is about 1500'x 1000'.
> 
> Approx the size of a football stadium  This is easier than inside a
> house -- should be no serious obstructions to block the signal. You
> may need an 8dbi omni or small sector antenna to increase signal
> coverage.   Just don't let water get into any antenna connectors.
> 
> The biggest secret about wireless communication is not how much power
> you put out (how loud you shout), but how good you can hear the signal
> (how good your ears -- antennae -- are).  Most folks get this
> backwards.

David,

I look at the spec of the high-gain omni antenna and it shows they have
the beam width around 38 oV. This means the area right below the antenna
has no coverage. Is it ok to have a smaller antenna below the high-gain
one with different channel ( I am going to use 802.11g ) in order to
cover that area ?

Thanks,

Vu